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TC9WMB4FU Datasheet(PDF) 7 Page - Toshiba Semiconductor |
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TC9WMB4FU Datasheet(HTML) 7 Page - Toshiba Semiconductor |
7 / 17 page TC9WMB4FU 2007-10-19 7 (2) Random read A random read reads data at a specified address. A dummy write is necessary to specify an address. In random read mode, supply a device address, W R/ ( = 0), and a word address after a start condition. Unlike a byte or page write, where write data is supplied immediately, a dummy write only specifies a word address. Then, supply a start condition and transfer a device address and W R/ ( = 1) in the same way as for a current address read, to read data from the specified address. (3) Sequential read A sequential read reads data sequentially from successive word addresses. For either current address read or random read, upon receiving a start condition, a device address and R/W ( = 1), an acknowledge (low) is placed on the SDA line, followed by the data at the address pointed to by the internal address counter. When an acknowledge (low) is then received, the word address is automatically incremented so that the next data is driven out. After the last address is reached, the word address is rolled over to address 0. Figure 9 SDA LINE 1 D 6 D 4 D 5 D 3 D 1 D 2 D 0 D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 D 4 D 5 D 3 D 1 D 2 D 0 DEVICE ADDRESS R E A D A C K R / W D 7 A C K S T O P DATA (n) READ DATA (n) DATA (n + 1) READ DATA (n + 1) A C K DATA (n + 2) READ DATA (n + 2) A C K D 7 D 6 DATA (n + m) READ DATA (n + m) N O A C K Address increment Address increment Address increment Address increment Figure 8 SDA LINE 1 010 0 W 6 W 4 W 5 W 3 W 1 W 2 W 0 S T A R T M S B DEVICE ADDRESS W R I T E L S B A C K R / W W 7 WORD ADDRESS (n) A C K A C K D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 DATA (n) S T O P L S B M S B 101 0 1 S T A R T M S B DEVICE ADDRESS R E A D L S B READ DATA (n) N O A C K Address increment DUMMY WRITE A 2 A 1 P 0 A 2 P 0 A 1 |
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